Determine the relative molecular weight of sulfuric acid, magnesium oxide, aluminum hydroxide.
August 24, 2021
To complete this task, we need a periodic table. To calculate the molecular weight, it is necessary to add the atomic masses that make up the molecule of the elements.
1. Sulfuric acid (H2SO4): Mr (H2SO4) = 2Ar (H) + Ar (S) + 4Ar (O) = 2 * 1 + 32 + 4 * 16 = 98 amu.
2. Magnesium oxide (MgO): Mr (MgO) = Ar (Mg) + Ar (O) = 24 + 16 = 40 amu.
3. Aluminum hydroxide (Al (OH) 3): Mr (Al (OH) 3) = Ar (AL) + 3Ar (O) + 3Ar (H) = 26 + 3 * 16 + 3 * 1 = 77
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